Why backup vendors that uses RHV api is attaching the snapshot disk to the agent VM before the snapshot operation is completed

Issue

• Commvault which uses RHV api to do the backup of the VMs is attaching the snapshot disk to the agent VM before the snapshot operation is completed.
• If the agent VM and the VM which is being backed up is on the same host, hotplugging the disk to the VM is failing with error below.

libvirtError: internal error: unable to execute QEMU command 'device_add': Failed to get shared "write" lock

• The VM is going into paused mode immediately after the disk hotplug.